Water soluble alkyd resin-wax composite coating release-controlling fertiliser and method for preparing same

A technology of alkyd resin and controlled-release fertilizer, which is applied in the field of materials and fertilizers, can solve the problem that the dissolved polymer film is not easy to degrade, and achieve the effect of excellent controlled-release performance, good controlled-release performance, and low dependence

Active Publication Date: 2012-10-24
KINGENTA ECOLOGICAL ENG GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to give full play to the advantages of environmental protection and low cost of water-based polymer-coated controlled-release fertilizers, it is necessary to overcome the defects that the water-soluble polymer coating agent itself dissolves the fertilizer and the polymer film is not easy to degrade.

Method used

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  • Water soluble alkyd resin-wax composite coating release-controlling fertiliser and method for preparing same

Examples

Experimental program
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Effect test

preparation example Construction

[0026] In a further preferred preparation method, firstly, fatty acids, polyols and dibasic acids (and / or their anhydrides) derived from plants are added to a reactor equipped with a stirrer, a reflux condenser, a thermometer and a nitrogen protection, and the temperature is 160~260 ℃ of reaction 0.5~6 hour, preferably 200~240 ℃ of reaction 2~4 hours, and remove the water that generates in the reaction with the water eliminator in time, then cool down to 120~200 ℃, add other polybasic acid (and / or its acid anhydride), the reaction is kept for at least 0.5 hours, and the water generated in the reaction is removed in time with a water eliminator. Optionally, add 2-20% by weight of rosin based on the total weight of the resin, preferably 3-10% by weight when the temperature is lowered to 130-160°C, and react at this temperature for 5 minutes to 2 hours, preferably 10 minutes to 0.5 hours . After cooling down, an alkyd resin prepolymer with a certain acid value is obtained. (2) ...

Embodiment 1

[0050] (1) Preparation of water-soluble alkyd resin coating agent

[0051] 480 grams of linseed oil, 236 grams of trimethylolpropane and 166 grams of isophthalic acid were added to the reactor equipped with a stirrer, reflux condenser, thermometer and nitrogen protection, and the temperature was raised to 235 ° C for 3.5 hours, and then the temperature was lowered. To 175 ° C, add 73 grams of trimellitic anhydride, react at this temperature for about 3 hours, and use a water eliminator to remove the water generated in the reaction in time, when the acid value of the system reaches 62 mgKOH / g resin, reduce the system temperature to 150 ° C, add 49 grams of rosin was reacted for 20 minutes.

[0052] Above-mentioned reaction system is cooled, when temperature is reduced to 70 ℃, add 70 grams of mixed solutions formed by ethylene glycol monobutyl ether and isopropanol (the weight ratio of the two is 1: 1.5) and mix well, drop to 50 ℃ In the following, the pH of the system was adj...

Embodiment 2

[0057] Same as Example 1, the difference is that diatomaceous earth is not used.

[0058] Calculated by dry matter weight, the obtained water-soluble alkyd resin-wax composite coated controlled-release fertilizer is composed of 89.6% of urea, 9% of polymer and 1.4% of paraffin. The nutrient release period of this controlled release fertilizer is 52 days.

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Abstract

The invention relates to a water-soluble alkyd resin-wax compound coated controlled release fertilizer and a preparation method thereof. The coated controlled release fertilizer consists of a fertilizer core and a capsule which is outside the fertilizer core; wherein, the capsule comprises a wax capsule, the exterior of the wax capsule has a polymer film that contains water-soluble alkyd resin coated agent and an inorganic layer that is arbitrarily arranged outside the polymer film and contains inorganic powders.

Description

technical field [0001] The invention relates to a film-coated controlled-release fertilizer, more particularly, to a water-soluble alkyd resin-wax composite film-coated controlled-release fertilizer and a preparation method thereof, belonging to the technical field of materials and fertilizers. Background technique [0002] How to improve the utilization rate of chemical fertilizers has always been a hot topic in fertilizer and plant nutrition research in recent years, and it is also one of the key issues to be solved urgently in the sustainable development of agriculture. Research and development of efficient and environmentally friendly slow-release fertilizers is an effective way to solve this problem. [0003] There are many types of commercial controlled-release fertilizers. Among them, polymer-coated controlled-release fertilizers have attracted worldwide attention and have been well used because of their excellent nutrient-controlled release properties. According to ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C05G3/00
Inventor 高义武万连步于兵李志国范玲超解玉洪
Owner KINGENTA ECOLOGICAL ENG GRP
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